How much is a 766 Farmall worth?

I have a great uncle in upstate NY who owns a 1974 766 Farmall that I want to eventually buy from him for my own farm. What know about the tractor physically is that it needs a new paint job(the paint is badly faded and decals are illegible), fender lights do not work, engine was overhauled in 1979 by Taylor Implements in Watertown, NY because the original owners beat the crap out of it because they never changed the fluids in it so eventually the motor blew up and the engine is overbored slightly giving it more hps, My grandfather bought it second hand in 1980 to work alongside his pre-existing Hydro 70 all the way up till he sold the cows in 2003 when i was 13 and so obviously I did not have the opportunity to buy it then his brother bough it off him, It used to have a IH 2350 Mount-o-Matic loader that used 2 be on the hydro Gramp sold in 1994 and replaced it with a new 5300 John Deere, the tractor has bad wobble on the front right wheel on the road, Tach is broke, ether assist is broke, Gears grind 2 beat the band(Grandpa told me that it had problems with the clutch brake), It is an open station w/wide coverage fenders, front tires are slighlty worn w/cracks and the rears are slighly worn with no cracks, the tractor has a new muffler(not that it helps much), and lastly it has had new pto clutches put in it, T/A works fine.Any thing I left out ask me, other than those things it still runs great and still runs a Knight 3050 TMR mixer and the G-6000 AG Bagger.

family can complicate things. Make sure sale contracts are written down and signed (notarized is best). Treat it like a normal business transaction, only with more attention to detail. You and your uncle might be on good terms now, but between the unknown, other family members, or a surprise nursing home residency things can be ugly should your uncle no longer be able to verify it being sold to you. Should it be given to you, still write up a sale contract for a dollar! I have been a part of, read about, and heard about family transactions getting messy. I recall some guys on here about to lose their tractor over family issues.
cover your butts!


location and demand drive prices.
check auction sites, ag classifieds and dealer listings for your area. I bet the prices range 3 to 12 grand nationwide! if you can compare similar shape machines and average the price out, you will be close enough to deal.

good luck
karl f

The engine is not overbored. They are a wet sleave engine and when rebuilt you put in new standard bore sleaves. They come with a D-360, and can be easily turned up to 125 Pto HP. If you really want to tear things up you can convert it to a DT-360 that is turboed and get 180 at the pto.

Around here a 766 would be a 5000.00 tractor the way you describe it. We have a couple and they are good tractors.

There were some 766s that came with the C291 gas, but that was a sleeved engine too. In a rebuild they wouldn't bother with an overbore, they would just put in new sleeves.

This particular model is a diesel and I believe it dynoed at roughly 93 hp so shes got lots of power one spring I recall doing some disking with it because the 4240 was drawing the springtooth harrows and nobody wanted to get stuck disking on the old Farmall except me. We had an old set of Allis Chalmers 15 foot disks and without duals I worked up 80 acres of corn stubble in 1 day that tractor amazed everybody but it just goes to show how well the 7 stacks up 2 the 42.